# 🛟 Troubleshooting

In case you encounter any issues while using ReVanced Manager, please refer to this page for possible solutions.

- ### 💥 App not installed as package conflicts with an existing package

  An existing installation of the application you're trying to patch is conflicting with the patched application. Uninstall the existing application before installing the patched application.

- ### ❗️Error code `135`, `139` or `1` when patching the application

  Your device is not supported. Refer to the [Prerequisites](0_prerequisites.md) page for supported devices.

  Alternatively, you can use [ReVanced CLI](https://github.com/revanced/revanced-cli) to patch the application.

- ### 🚫 Non-root install is not possible with the current patches selection

  Select the **Default** chip when choosing patches.

- ### 🚨 Patched application crashes on launch

  Select the **Default** chip when choosing patches.

## ### ⏭️ What's next

The next page will teach you how to build ReVanced Manager from source.

Continue: [🛠️ Building from source](4_building.md)